**Health Benefits of Laughter**
*Lower blood pressure
* Increase vascular blood flow and oxygenation of the blood
* Give a workout to the diaphragm and abdominal, respiratory, facial, leg, and back muscles
* Reduce certain stress hormones such as cortisol and adrenaline
*Increase the response of tumor- and disease-killing cells such as Gamma-interferon and T-cells
* Defend against respiratory infections–even reducing the frequency of colds–by immunoglobulon in saliva.
*Increase memory and learning; in a study at Johns Hopkins University Medical School, humor during instruction led to increased test scores
* Improve alertness, creativity, and memory
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